Place mushrooms, top side up, on rack in broiling pan. Brush mushroom tops with 1 tablespoon dressing. Place pan in broiler at closest position to source of heat; broil mushrooms 4 minutes. Turn mushrooms over; brush with 2 more tablespoons dressing and broil 5 minutes longer or until tender.

Thickly slice mushrooms and arrange on arugula. Spoon remaining dressing over salad. Arrange prosciutto on platter with salad. Top with Parmesan curls.

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